<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Document</title>
</head>
<body>
<form action="login.php" method="post">
	帐号：<input type="text" name="username"/><br/>
	密码：<input type="password" name="password"><br/>
	验证码:
	<input type="text" name="code">
	<img src="code.php" onclick="this.src='code.php?'+Math.random()"><br/>
	<input type="submit">
</form>
</body>
</html>